If you can only have one pistol (in some countries you can only have one) and if its a Glock 19 you can do no better, it is a tough as nails cold stone reliable handgun.

On those ASian Glock Mags, when i bought my Glock 17 the dealer gave me 2 for free, they have never failed under any circumstances, however for self defense carry i would carry the Glock mags that came with your G19.